For archives divided into subject classes:
If the archive to which you are subscribing requires distinct subject classes
(such as the math, physics, cs,
q-bio and q-fin archives; but not
astro-ph, cond-mat or nlin,
see handling subscriptions to all physics archives
through physics below), then you (un)subscribe to a specific
category, indicating the categories in the body of the message. Here is
an example

You may alternatively use the short subject class codes, for example to subscribe to the
Risk Management category (q-fin.RM) in Quantitative Finance:

To: q-fin@arxiv.org
Subject: subscribe John Smithadd RM

For archives not divided into subject classes:
Send an e-mail message to the archive(s) of interest, in the
following form

To: arch-ive@arxiv.org
Subject: subscribe Your Full Name

You should give your name as you wish it to appear on the
distribution list. Here is an example:

To: quant-ph@arxiv.org
Subject: subscribe John Smith

(Subscribing to cond-mat in this way will subscribe you to
all cond-mat subject classes.)

Handling subscriptions to all physics archives through physics
The physics archive can be used to subscribe to any
combination of existing physics archives, e.g. to something like
`General Relativity', `Astrophysics', and `High Energy Physics - Experimental'.
This is also the only way to subscribe to a subset of the subject classes
within the astro-ph, cond-mat and nlin
archives.
For example, to subscribe only to the cond-mat subject classes
`Soft Condensed Matter' and `Superconductivity', the email would read:

If you want to change from, say, subscribing to all of astro-ph to
subscribing to just astro-ph.EP then you must first cancel
the subscription to astro-ph, and then subscribe to EP through
the physics archive.

To Cancel Your Subscription

If you want to cancel your receipt of the regular listings,
you can do so as follows.

Find the e-mail address of the archive for which you are receiving
the listings.

Send an e-mail message to the archive, in the
following form

To: arch-ive@arxiv.org
Subject: cancel

Here is an example:

To: quant-ph@arxiv.org
Subject: cancel

If you want to cancel your subscription to a particular
subject class in an archive that supports subject classes,
then see the example use of del in the
subscribe command above.

Note that you may be subscribed through a remote listserv,
or through some local preprint distribution list at your end.
You can determine the origin of your subscription by examining the
the header from the daily mailing you receive. You will have to deal
with this through the administrator of the remote distribution list.